Journal of Jilin University(Engineering and Technology Edition) ›› 2022, Vol. 52 ›› Issue (3): 497-503.doi: 10.13229/j.cnki.jdxbgxb20200800

   

Experimental analysis of mechanical properties of surface lunar soil based on lunar indentation

Long XUE1(),Meng YAO2,Li-ben LI3,Yin-wu LI3,Xiang-jin DENG2,Jian-qiao LI3,Meng ZOU3()   

  1. 1.Key Lab of Modern Agricultural Equipment，Jiangxi Agricultural University，Nanchang 330045，China
    2.Beijing Institute of Spacecraft System Engineering，China Academy of Space Technology，Beijing 100094，China
    3.Key Laboratory of Bionic Engineering，Ministry of Education，Jilin University，Changchun 130022，China
  • Received:2020-10-19 Online:2022-03-01 Published:2022-03-08
  • Contact: Meng ZOU E-mail:ultimata@163.com;zoumeng@jlu.edu.cn

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Abstract:

Based on the indentation， geometric parameters （surface area and depth） obtained by stereo camera were used to identify pressure-sinkage model coefficient combined with least square method. Three kinds of lunar soil simulant （CE5_1， CE5_2 and CE5_3） were used in these studies and each kind of simulant was prepared based on bulk density for three states （soft， normal and hard）. There were 264 data including 96 data of CE5_1， 36 data of CE5_2 and 36 data of CE5_3. The data of each kinds of simulant was randomized in two data set according to the ratio of 3∶2， one was calibration data set， the other was prediction data set. Based on the pressure-sinkage model coefficient obtained by calibration data set， the accuracy of prediction data set of CE5_1， CE5_2 and CE5_3 were 0.985， 0.965 and 0.971， respectively. The results show that this pressure-sinkage model can be used to provide numerical reference to determine the extent of soft and hard lunar surface which can provide reference for excavation depth of lunar regolith sampler.

Key words: terramechanics, regolith sampling, lunar soil, pressure sinkage

CLC Number: 

  • TB17

Table 1

Relative density and soil porosity of lunar soil simulant"

模拟月壤状态相对密度/%孔隙比
松软301.45
中密501.16
密实700.94

Fig.1

Particle size distribution of CE5"

Fig.2

Test equipment"

Fig.3

Sensor simulators"

Fig.4

Contact process of sensor and lunar"

Fig.5

Indentation morphology"

Fig.6

Indentation geometric model"

Table 2

Test data statistics"

模拟月壤类型建模组预测组合计
CE5_19648144
CE5_2362460
CE5_3362460

Fig.7

Measured versus predictednormal stress of CE5_1"

Fig.8

Measured versus predictednormal stress of CE5_2"

Fig.9

Measured versus predictednormal stress of CE5_3"

Table 3

Calculation results using least square method"

模拟月壤类型模型预测组RRMSE
CE5_1p=1.42z-0.50480.9850.038
CE5_2p=1.47z-0.55240.9650.076
CE5_3p=1.49z-0.55240.9710.042

Fig.10

Pressure-sinkage model curve of CE5"

Fig.11

Experimental image at test ground"

Table 4

Depth of indentation and normal stress using pressure-sinkage model"

图像深度/cm正应力/（N?cm-2）
CE5_1CE5_2CE5_3
图11（a）7.03691.69281.78341.8077
图11（b）3.67642.34192.54882.5835
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